﻿using System;
using System.Data.Entity;
using System.Data.Entity.Infrastructure;
using System.Threading;
using System.Web.Mvc;
using WebMatrix.WebData;
using ChatterBox.Models;

namespace ChatterBox.Filters
{
    [AttributeUsage( AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true )]
    public sealed class InitializeSimpleMembershipAttribute : ActionFilterAttribute
    {
        private static SimpleMembershipInitializer _initializer;
        private static object _initializerLock = new object();
        private static bool _isInitialized;

        public override void OnActionExecuting( ActionExecutingContext filterContext )
        {
            // Ensure ASP.NET Simple Membership is initialized only once per app start
            LazyInitializer.EnsureInitialized( ref _initializer, ref _isInitialized, ref _initializerLock );
        }

        private class SimpleMembershipInitializer
        {
            public SimpleMembershipInitializer()
            {
                Database.SetInitializer<UsersContext>( null );

                try
                {
                    using ( var context = new UsersContext() )
                    {
                        if ( !context.Database.Exists() )
                        {
                            // Create the SimpleMembership database without Entity Framework migration schema
                            ( (IObjectContextAdapter)context ).ObjectContext.CreateDatabase();
                        }
                    }

                    WebSecurity.InitializeDatabaseConnection( "DefaultConnection", "UserProfile", "UserId", "UserName", autoCreateTables: true );
                }
                catch ( Exception ex )
                {
                    throw new InvalidOperationException( "The ASP.NET Simple Membership database could not be initialized. For more information, please see http://go.microsoft.com/fwlink/?LinkId=256588", ex );
                }
            }
        }
    }
}
